[Webkit-unassigned] [Bug 86438] New: FunctionParameters waste a lot of Vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86438

           Summary: FunctionParameters waste a lot of Vector capacity
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: ggaren at apple.com, oliver at apple.com,
                    barraclough at apple.com, msaboff at apple.com,
                    fpizlo at apple.com


Data collected via bug 86281 show that a lot of vector capacity is wasted via the Vector allocated here:

6369 vectors, 60.39KB used of 546.38KB, 485.98KB wasted at:
1   0x10696fa45 WTF::Vector<JSC::Identifier, 0ul>::Vector()
2   0x106bb9ee0 JSC::FunctionParameters::FunctionParameters(JSC::ParameterNode*)
3   0x106bb9ead JSC::FunctionParameters::FunctionParameters(JSC::ParameterNode*)
4   0x106bbac59 JSC::FunctionParameters::create(JSC::ParameterNode*)
5   0x106bb9f84 JSC::FunctionBodyNode::finishParsing(JSC::SourceCode const&, JSC::ParameterNode*, JSC::Identifier const&)

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